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2 (p +l) = keliling
2( 3x + 2x) = 100
5x = 50
x=10
sehingga panjangnya = 3x = 3 . 10 = 30 m :)
semoga membantu:)
6x + 4x = 100
10x = 100
x = 100/10
x = 10
panjang = 3x = 3 x 10
= 30 cm